MPR121 Capacitive Touch Sensor Module – I2C Arduino Keyboard
MPR121 Capacitive Touch Sensor Module – I2C Arduino Keyboard
MPR121 Breakout V1.2 Capacitive Touch Sensor Controller Module
The MPR121 Breakout V1.2 is a compact, high-performance capacitive touch sensor controller module designed for makers, hobbyists, and engineers working with Arduino and other development boards. Using the I2C communication protocol, this module enables you to add up to 12 independent touch-sensitive inputs to your project with minimal wiring and effort.
Whether you're building a custom keyboard, interactive installation, musical instrument, or any touch-sensitive interface, this module delivers reliable detection and seamless integration with Arduino, Raspberry Pi, and compatible platforms.
Made in Mainland China.
Key Features
- 12 Capacitive Touch Channels: Detect touch on up to 12 electrodes independently — ideal for custom keyboards, sliders, and input panels.
- I2C Interface: Simple two-wire communication (SDA/SCL) keeps wiring clean and frees up GPIO pins on your development board.
- Wide Operating Temperature: Reliable performance from -40°C to +85°C, suitable for a variety of environments.
- Low Supply Voltage: Operates at 2.5V–3.6V, making it compatible with 3.3V systems including Arduino and Raspberry Pi.
- SMD Package: Compact surface-mount design for easy integration into projects and prototypes.
- No High-Concern Chemicals: Safe for general electronics use.
- New Condition: Brand new module, ready to use out of the box.
Technical Specifications
| Communication Protocol | I2C |
| Supply Voltage | 2.5V – 3.6V |
| Touch Channels | 12 |
| Operating Temperature | -40°C to +85°C |
| Package Type | SMD |
| Country of Origin | Mainland China |
| Quantity | 1 Module |
Perfect For
- Arduino-based touch keyboard projects
- Interactive DIY electronics and prototyping
- Custom human-machine interfaces (HMI)
- Touch-sensitive musical instruments
- Maker fairs, STEM education, and lab experiments
Related Products You May Like
- Electromagnetic Induction Tester – Coil & Circuit Fault Detector
- Air Compressor Pressure Gauge 0-10/0-12/0-25 Bar | DIY Tool
- 360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit
Learn more: OSHA on eye and face protection
Frequently Asked Questions
Q: Is the MPR121 Capacitive Touch Sensor Module compatible with Arduino boards?
A: Yes! The MPR121 module communicates via the I2C protocol (SDA/SCL pins), making it fully compatible with Arduino Uno, Mega, Nano, and most other Arduino development boards, as well as Raspberry Pi and other 3.3V-compatible platforms.
Q: How many touch inputs can the MPR121 module support?
A: The MPR121 supports up to 12 independent capacitive touch channels, allowing you to create custom keyboards, button arrays, sliders, or any other multi-input touch interface for your project.
Q: What voltage does the MPR121 Breakout module require?
A: The module operates on a supply voltage of 2.5V to 3.6V, making it ideal for use with 3.3V Arduino, Raspberry Pi, and similar microcontroller platforms.
Q: Can I use this module for DIY touch keyboard projects?
A: Absolutely. The MPR121 I2C Capacitive Touch Sensor module is a popular choice for building custom DIY touch keyboards, MIDI controllers, interactive displays, and other touch-sensitive electronic projects.